WorldCat Identities

Clark Atlanta University

Overview
Works: 1,700 works in 1,735 publications in 1 language and 4,263 library holdings
Genres: Periodicals  Catalogs  Conference papers and proceedings  Criticism, interpretation, etc 
Roles: Researcher
Classifications: E185.5, 909.0496005
Publication Timeline
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Most widely held works by Clark Atlanta University
Phylon( )

in English and held by 1,325 WorldCat member libraries worldwide

The Status of Black Atlanta( )

in English and held by 95 WorldCat member libraries worldwide

Chemically derived dense alumina-zirconia composites for improved mechanical and wear erosion properties final report for project no. NAG4-0011( Book )

1 edition published in 1998 in English and held by 85 WorldCat member libraries worldwide

In the eye of the muses : selections from the Clark Atlanta University art collection by Clark Atlanta University( Book )

2 editions published in 2012 in English and held by 77 WorldCat member libraries worldwide

Clark Atlanta University Art Galleries in Atlanta, Georgia celebrates the seventieth anniversary of the founding of its permanent collection and the sixtieth anniversary of the unveiling of the 'Art of the Negro' murals with this commemorative volume. Initially conceived with works selected from annual exhibitions, the collection today constitutes a rare and remarkable assemblage of African-American art. This book tells the story of the Atlanta University Art Annuals held between 1942 and 1970, from which the collection stemmed, cataloging the 887 artists who participated and crucially enhancing our understanding of art by African Americans. In an accompanying essay, Hale Woodruff's 'Art of the Negro' mural suite is eloquently explicated by art critic Jerry Cullum. 'In the Eye of the Muses' presents a monumental catalogue of a unique collection
The status of Black Atlanta 1993 by Southern Center for Studies in Public Policy( Book )

2 editions published in 1993 in English and held by 65 WorldCat member libraries worldwide

Proceedings of the American Society for Composites Eleventh Technical Conference : October 7-9, Omni Hotel at CNN, Atlanta, Georgia by American Society for Composites( Book )

1 edition published in 1996 in English and held by 22 WorldCat member libraries worldwide

Phylon quarterly( )

in English and held by 8 WorldCat member libraries worldwide

Racing to save the planet environmental career opportunities for minorities( Visual )

1 edition published in 1993 in English and held by 7 WorldCat member libraries worldwide

Literary magnitude: classics in non-Western traditions( Book )

1 edition published in 1990 in English and held by 7 WorldCat member libraries worldwide

A NEW CLASS MESOPOROUS ALUMINOPHOSPHATES AS POTENTIAL CATALYSTS IN THE UPGRADING PETROLEUM FEEDSTOCKS( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

A comprehensive investigation was conducted towards the synthesis and catalytic evaluation of high surface areas, uniform pore size, mesoporous aluminophosphates (AlPO₄) as potential catalysts for the upgrading of heavy petroleum feedstock, such as heavy crudes and petroleum residuum. The influence of several synthesis variables (including, the nature of the reactants, chemical composition of reaction mixtures, time and temperature) on the synthesis and physicochemical characteristics of the resulting products was explored. Phosphoric acid and three different aluminum sources, namely, aluminum hydroxide, aluminum isopropoxide and psuedobohemite alumina, were used as the inorganic precursors. Cetyltrimethylammonium chloride (C₁₆TACl) surfactant was used as charge compensating cation and structure directing agent in the surfactant-micellar-mediated synthesis pathway employed. Synthesis were conducted from reaction mixtures within the following typical molar composition range: xAl₂O₃:P₂O₅:yC₁₆TMACl: zTHMAOH: wH₂O, where x = 0.29-2.34, y = 0.24-0.98, z = 0.34-1.95, w = 86-700. Selected materials were evaluated for the conversion of isopropylbenzene (cumene) in order to understand the nature of any acid sites created. The synthesis products obtained depended strongly on the molar composition of the synthesis mixture. A lamellar (layered) phase was favored by synthesis mixtures comprised of low Al/P ratios (<0.33), low TMAOH content, high C₁₆TACl concentrations and high synthesis temperature (110 C). Formation of the desired hexagonal (tubular) phase was favored by higher Al/P ratios and TMAOH content, pH range between 8-10, low C₁₆TACl concentration and ambient temperature. The aluminum source had significant influence on the products obtained. With aluminum hydroxide (A1(OH)₃) as the hydroxide source, the resulting hexagonal phase in the ''as-synthesized'' form demonstrated well defined ordered mesoporous structure for synthesis mixtures of Al/P ratios in the range of 0.47-1.25, above which increasingly disordered products were observed. The products were however unstable to calcination in air above 400 C to remove the organic template, under which structural collapsed was observed. Products formed using pseudoboehmite alumina (catapal B), were more thermally stable than those formed with aluminum isopropoxide, though all products experienced some degree of structural collapsed on calcination and yielded micro- or micro-mesoporous materials ranging from low (<500 m²/g) to high surface areas (>500 m²/g) and pore sizes ranging from microporous (<1.5 nm) in some products to mesoporous (up to 3.6 nm) in other. Improvement in thermal stability was not observed when Mg and Co or bridging organic functional groups were incorporated with the mesoporous framework. The products showed negligible activity for the conversion of cumene at 300 C. Further research is necessary to investigate alternative synthesis strategies to strengthen and improve the thermal stabilities of these aluminophosphates
A model approach to highly dispersing catalytic materials in coal for gasification( )

2 editions published in 1992 in English and held by 0 WorldCat member libraries worldwide

This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and higher catalytic activity of the latter compound will produce economic benefits by reducing the amount of K[sub 2]CO[sub 3] required for high coal char reactivities. As was shown in previous reports, coal loading with potassium or calcium at different pHs produced CO[sub 2] gasification activities which increased in the order pH 6> pH 10>>pH 1. A similar trend was obtained when calcium and potassium were simultaneously loaded and char reaction times were less than about 75 min. In the last quarter, the potential application of ammonia as a reactive medium for coal gasification has been investigated. This gas has not been previously applied to coal gasification. However, related work suggests that the potential chemical feedstock base can be broadened by using ammonia to generate hydrogen cyanide and cyanogen from coal. The current report shows that the reactivity of a demineralized lignite in ammonia is significantly higher in the presence of calcium or potassium catalyst than that for the char without added catalyst and suggests that ammonia is a potentially reactive gas for catalyzed coal gasification
IMPROVED CATALYSTS FOR HEAVY OIL UPGRADING BASED ON ZEOLITE Y NANOPARTICLES ENCAPSULATED IN STABLE NANOPOROUS HOSTS( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

The focus of this project is to improve the catalytic performance of zeolite Y for heavy petroleum hydrocracking by synthesizing nanoparticles of the zeolite ((almost equal to)20-30 nm) inside nanoporous silicate or aluminosilicate hosts of similar pore diameters. The encapsulated zeolite nanoparticles are expected to possess pores of reduced diffusional path lengths, hence hydrocarbon substrates will diffuse in, are converted and the products quickly diffused out. This is expected to prevent over-reaction, hence minimizing pore blockage and active sites deactivation. In this phase of the project, research activities were focused on refining procedures to: (a) improve the synthesis of ordered, high surface area nanoporous silica, such as SBA-15, with expanded pore size using trimethylbenzene as additive to the parent SBA-15 synthesis mixture; and (b) reduce the particle size of zeolite Y such that they can be effectively incorporated into the nanoporous silicas. The synthesis of high surface ordered nanoporous silica containing enlarged pores of diameter of 25 nm (larger than the standard size of 8.4 nm) using trimethylbenzene as a pore size expander was accomplished. The synthesis of zeolite Y nanoparticles with median pore size of approximately 50 nm (smaller than the 80 nm typically obtained with TMAOH) using combined TMABr/TMAOH as organic additives was also accomplished
Alternative formulations of regenerable flue gas cleanup catalysts. Progress report, September 1, 1990--August 31, 1991( )

4 editions published between 1991 and 1992 in English and held by 0 WorldCat member libraries worldwide

We have used non-aqueous impregnation techniques to prepare an aluminum oxide surface covered with a well-dispersed magnesium oxide layer using magnesium acetylacetonate dehydrate [Mg(acac)₂{sm_bullet}2H₂0] as a precursor. Using lithium acetylacetonate as a precursor, we have begun attempts to prepare a similarly well dispersed surface layer of lithium ''oxide.'' We have generated higher weight loadings of magnesium on alumina by using a Soxhlet extractor to dissolve the sparingly soluble Mg(acac)₂{sm_bullet}2H₂0 in methanol. With this device we are able to obtain loadings of MgO on the alumina up to 0.66 wt/wt%. The precursor samples were examined by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and our results indicate that the complex loses the water of hydration upon adsorption. It appears, however, that the initial form of the complex on the surface is as anhydrous crystallites. Heating the supported precursor under vacuum leads to ''melting'' of the crystals, which can be observed by DRIFTS. Decomposition of the precursor under nitrogen or air leads to very similar activity when adsorbing SO₂. SO₂ uptake appears to be independent of whether O₂ is Present in the gas stream or not. We have shown that SO₂ adsorption increases with Mg-loading on the impregnated aluminas, with 0.85 additional molecules Of SO₂ adsorbed for each additional Mg atom (or MgO molecule) on the surface. We have shown that non-aqueous impregnation leads to samples which are more efficient with regard to SO₂ uptake per magnesium atom than aqueous impregnation
Measuring food security in the Dominican Republic : adaptation of the U.S. food security survey module by Mesfin Bezuneh( )

1 edition published in 2008 in English and held by 0 WorldCat member libraries worldwide

A novel approach to highly dispersing catalytic materials in coal for gasification. Second quarterly report, January 1, 1990--March 31, 1990( )

4 editions published between 1990 and 1991 in English and held by 0 WorldCat member libraries worldwide

This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The work is focused on the elucidation of coal-catalyst precursor interactions in solution and the variables which control the adsorption and dispersion of coal gasification metal catalysts. In order to optimize coal-metal ion interactions and hence maximize catalyst activity, the study examines the surface electrochemistry of a lignite, a subbituminous, and a bituminous coals and their demineralized and oxidized derivatives prior to loading with the catalytic materials. The surface electrical properties of the coals are investigated with the aid of electrophoresis, while the effects of the surface charge on the adsorption of K and Ca{sup 2+} are studied by agitating the coals with aqueous solutions of potassium and calcium. Zeta potential studies show that the surfaces of the lignite are negatively charged between about pH2 to 11, the negative charge density increasing with increase in pH. Highly alkaline media promoted calcium adsorption due to high negative charge on the coal, while calcium uptake was inhibited in strongly acidic solutions
IMPROVED CATALYSTS FOR HEAVY OIL UPGRADING BASED ON ZEOLITE Y NANOPARTICLES ENCAPSULATED IN STABLE NANOPOROUS HOST( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

Composite materials of SBA-15/zeolite Y were synthesized from zeolite Y precursor and a synthesis mixture of mesoporous silicate SBA-15 via a hydrothermal process in the presence of a slightly acidic media of pH 4-6 with 2M H₂SO₄. The SBA-15/ZY composites showed Type IV adsorption isotherms, narrow BJH average pore size distribution of 4.9 nm, surface areas up to 800 m²²g and pore volumes 1.03 cm³, all comparable to pure SBA-15 synthesized under similar conditions. Chemical analysis revealed Si/Al ratio down to 8.5 in the most aluminated sample, and ²⁷AlSS MAS NMR confirmed aluminum was in tetrahedral coordination. This method of introduction of Al in pure T{sub d} coordination is effective in comparison to other direct and post synthesis alumination methods. Bronsted acid sites were evident from a pyridinium peak at 1544 cm-1 in the FTIR spectrum after pyridine adsorption, and from NH₃ -TPD experiments. SBA-15/ZY composites showed significant catalytic activities for the dealkylation of isopropylbenzene to benzene and propene, similar to those of commercial zeolite Y. It was observed that higher conversion for catalysts synthesized with high amount of ZY precursor mixture added to the SBA-15. Over all the composites has shown good catalytic activity. Further studies will be focused on gaining a better understand the nature of the precursor, and to characterize and to locate the acid sites in the composite material. The composite will also be evaluated for heavy oil conversion to naphtha and middle distillates
An Integrated Hydrogen Producton-CO2 Capture Process from Fossil Fuel( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

The major project objective is to determine the feasibility of using the char from coal and/or biomass pyrolysis, ammonia and CO2 emissions at smokestacks to produce clean hydrogen and a sequestered carbon fertilizer. During this work period, literature review has been completed. The project plan, design and test schedules were made on the basis of discussion with partner in experimental issues. Installation of pilot scale units was finished and major units tests were fully performed. Modification of the pyrolyzer, reformer and gas absorption tank have been done. Integration testing is performing recently. Lab scale tests have been performed. Field tests of char/fertilizer have been conducted. The experimental results are discussed in this paper
IMPROVED CATALYSTS FOR HEAVY OIL UPGRADING BASED ON ZEOLITE Y NANOPARTICLES ENCAPSULATED IN STABLE NANOPOROUS HOSTS( )

1 edition published in 2003 in English and held by 0 WorldCat member libraries worldwide

The focus of this project is to improve the catalytic performance of zeolite Y for petroleum hydrocracking by synthesizing nanoparticles of the zeolite ({approx}20-25 nm) inside nanoporous silicate or aluminosilicate hosts. The encapsulated zeolite nanoparticles are expected to possess reduced diffusional path lengths, hence hydrocarbon substrates will diffuse in, are converted and the products quickly diffused out. This is expected to prevent over-reaction and the blocking of the zeolite pores and active sites will be minimized. In this phase of the project, procedures for the synthesis of ordered nanoporous silica, such as SBA-15, using block copolymers and nonionic surfactant were successful reproduced. Expansion of the pores sizes of the nanoporous silica using trimethylbenzene is suggested based on shift in the major X-Ray Diffraction peak in the products to lower 2 angles compared with the parent SBA-15 material. The synthesis of ordered nanoporous materials with aluminum incorporated in the predominantly silicate framework was attempted but is not yet successful, and the procedures needs will be repeated and modified as necessary. Nanoparticles of zeolite Y of particle sizes in the range 40 nm to 120 nm were synthesized in the presence of TMAOH as the particle size controlling additive
IMPROVED CATALYSTS FOR HEAVY OIL UPGRADING BASED ON ZEOLITE Y NANOPARTICLES ENCAPSULATED STABLE NANOPOROUS HOST( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

The objectives of this project are to synthesis nanocrystals of highly acidic zeolite Y, encapsulate them within the channels of mesoporous (nanoporous) silicates or nanoporous organosilicates and evaluate the ''zeolite Y/Nanoporous host'' composites as catalysts for the upgrading of heavy petroleum feedstocks. Our results to date are summarized as follows. The synthesis of high surface ordered nanoporous silica of expanded pore diameter of 25 nm (larger than the standard size of 8.4 nm) using trimethylbenzene as a pore size expander was accomplished. The synthesis of zeolite Y nanoparticles with median pore size of approximately 50 nm (smaller than the 80 nm typically obtained with TMAOH) using combined TMABr/TMAOH as organic additives was also accomplished. The successful synthesis of zeoliteY/Nanoporous host composite materials by sequential combination of zeolite precursors and nanoporous material precursor mixtures was implied based on results from various characterization techniques such as X-Ray diffraction, infrared spectra, thermal analysis, porosimetry data. The resulting materials showed pore sizes up to 11 nm, and infrared band at 570 cm⁻¹ suggesting the presence of both phases. Work in the immediate future will be focused on the following three areas: (1) Further characterization of all-silica and aluminosilicate mesoporous materials with expanded pore sizes up to 30 nm will continue; (2) Research efforts to reduce the average particle size of zeolite nanoparticles down to 35-30 nm will continue; (3) Further synthesis of polymer-SBA15 nanocomposites will be conducted by changing the amount and chemistry of the zeolitic precursors added; and (4) Investigation on the catalytic properties of the materials using probe catalytic reactions (such as cumene cracking), followed by catalytic testing for heavy oil conversion
The role of catalyst precursor anions in coal gasification. Eighth quarterly report, [July--September 1993]( )

7 editions published between 1992 and 1994 in English and held by 0 WorldCat member libraries worldwide

The aims of the proposed project are to enrich our understanding of the roles of various aqueous soluble catalyst precursor anions on the surface electrical properties of coal and to ascertain the influence of the surface charge on the adsorption, dispersion, and activities of calcium and potassium. These goals will be achieved by impregnating a demineralized North Dakota lignite (PSOC 1482) with calcium or potassium catalyst precursors containing acetate (CH₃COO⁻), chloride (CI⁻), nitrate (NO₃⁻), sulfate (SO₄²⁻), and carbonate (CO₃²⁻) anions. In the past quarter, the effects of (CH₃COO⁻), CI⁻, (NO₃⁻), (CO₃²⁻) or (CO₃²⁻) on the surface charge properties of the coal has been initiated using the calcium salts of these anions. Like the corresponding potassium compounds investigated previously, increasing anion concentrations produce less negative charge on the coal surface through the interaction of calcium ions with the surface. This was confirmed by metal adsorption and chemical analysis of the filtered coal particles. The extent of metal adsorption was strongly dependent on the catalyst precursor. For potassium, maximum metal uptake from solution was obtained using potassium carbonate, followed by potassium acetate, while the lowest metal loadings were obtained when using the chloride, nitrate or the sulfate of potassium. The adsorption data are generally in agreement with the zeta potential results and suggest electrostatic attraction between the metal cation and the anionic coal surface. Fourier transform infrared studies are in progress to elucidate the coal-catalyst interactions
 
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Alternative Names

controlled identityAtlanta University

controlled identityClark College

Atlanta University Center Clark Atlanta University

Atlanta University Center (Ga.) Clark Atlanta University

CAU

Clark University Atlanta, Ga

Universidade de Atlanta

université Clark-Atlanta université privée américaine

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English (66)

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