摘要:

The article reviews some of the technical Intricacies which are Involved In the preparation of metal oxide containing catalysts. In processing of energy resources, representative reactions catalysed by metal oxides Include cracking, reforming, hydrofining, water-gas shift, and methanol synthesis. The preparatory methods of metal catalysts control the selectivity, stability and activity for a particular reaction.

ISSN:0884-3759    

DOI:10.1080/08843758608915835

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Vanadyl deoxophy lloerythroetioporphyrins (DPEP) and vanadyl etioporphyrins (ETIO) have been identified in Gato Ridge and Boscan petroleum samples using a combination of isobutane chemical ionization and tandem mass spectrometry. In addition, particular porphyrins such as the C30vanadyl DPEP and ETIO species were identified in a crude oil containing approximately 500 ppm total porphyrins, with only minimal sample clean-up.

ISSN:0884-3759    

DOI:10.1080/08843758608915836

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Adsorption chromatography together with GPC have shown that the reduction of both bitumen and coal derived asphaltenes produces tower m.w. material with concurrent appearance of small amounts of higher m.w. components. The lower m.w. components could be separated into saturated and aromatic hydrocarbons and oxygenated material. In the case of coal derived asphaltenes some basic material could also be found. Polarography and cyclic voltaircnetry showed that oxidation/reduction processes occurred for the products of preparatively electroreduced asphaltenes but failed to identify the nature of the acceptors involved.

ISSN:0884-3759    

DOI:10.1080/08843758608915837

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In order to investigate the effective mechanism of pyrite catalyst, coal liquefaction was conducted using a 500 ml autoclave. When the chemical structure characteristics of products and product yields are considered as a whole, deoxygenation and dealkylation are found to be enhanced in the presence of pyrite catalyst. Further, it is surmised that depolymerization is faster than the removal of heteroatoms.

ISSN:0884-3759    

DOI:10.1080/08843758608915838

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Boscan vacuum residuum (VR), and Maya atmospheric residuum (AR), were separated into operationally defined components by an isooctane asphaltene precipitation followed by a modified D 2007-80 separation of the isooctane soluble material. These collected fractions were examined by size exclusion chromatography (SEC) with element specific detection employing inductively coupled plasma emission spectroscopy (ICP) to investigate the effect the separation has on the the V and Ni compounds. The V and Ni SEC-ICP profiles of the asphaltene fractions indicated some of the metal-containing molecules are substantially larger in size than those observed in the residua. The asphaltene precipitation appears to cause an increase in molecular size through agglomeration of smaller constituents, and accomplishes only limited size separation of the metal-containing compounds.

ISSN:0884-3759    

DOI:10.1080/08843758608915839

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Boscan vacuum residuum (VR) has been separated into isooctane insoluble asphaltenes and isooctane soluble maltenes. The asphaltenes were dissolved in a minimum of toluene and were further separated by two additional reprecipitations using isooctane as the precipitating solvent. We examined the fractions, including the recovered isooctane soluble material, by size exclusion chromatography (SEC) with inductively coupled plasma (ICP) emission spectroscopy to determine the effects, if any, the reprecipitations have on the size distribution of the metal-containing compounds.

ISSN:0884-3759    

DOI:10.1080/08843758608915840

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor