Influence of the Conditions of Dealumination and the Effect of Partial Extraction of Non-Framework Aluminium on the Catalytic Properties of Zsm-5 Catalysts

Öhlmann, G.; Jerschkewitz, H.-G.; Lischke, G.; Eckelt, Reinhard; Groß, Th.; Parlitz, B.; Schulz, I.; Wehner, Katja; Timm, David D.

doi:10.1016/s0167-2991(08)62926-2

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Apparently, Lewis acid sites can also be involved in cracking, although the role of Lewis acid sites has not yet been clearly defined. 481,482 The acid site distribution can be varied by changing the Si:Al ratio during synthesis or by dealumination through steaming. Catalytic cracking of butenes was conducted with the aim of maximising the yield of propene as a feed for petrochemical industry.…”

Section: Zeolitic Silica-alumina Fcc Catalystsmentioning

confidence: 99%

Catalysis in the Upgrading of Fischer–Tropsch Syncrude

2010

Catalysis in the Refining of Fischer-Tropsch Syncrude

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The catalysis of conversion technologies that are found in most commercial Fischer–Tropsch upgrading and refining facilities are discussed. Four main classes of catalysis are considered, namely a) alkene oligomerisation, b) isomerisation and hydroisomerisation of alkanes and alkenes, c) cracking and hydrocracking, and d) hydrotreating. The focus is on catalysis, with aspects such as oxygenates, oxygenate related deactivation, commercial processes and Fischer–Tropsch application specifics being highlighted.

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Section: Zeolitic Silica-alumina Fcc Catalystsmentioning

confidence: 99%

Catalysis in the Upgrading of Fischer–Tropsch Syncrude

2010

Catalysis in the Refining of Fischer-Tropsch Syncrude

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Study on the Course of Crystallization of Gallosilicate with MFI Structure

Tuấn¹,

Fricke²,

Jänchen³

et al. 1992

Cryst. Res. Technol.

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The kinetics of nucleation and crystallization of zeolite Ga-ZSM-5 crystallized in the system 15 Na,O * xGa,O, * 100 SiO, * 13 TPABr * 4400 H,O is investigated. The course of crystallization is followed by different methods: XRD, MIR, TG-DTA, n-hexane adsorption, NH,-TPD and pHmeasurement.The low apparent activation energies of nucleation En = 42.5 KJ/mole and crystallization E, = 20.4 KJ/mole show that the incorporation of gallium into the framework of the zeolite is not as difficult as expected from the disruptive nature of this process. Other synthesis parameters, e.g. temperature, alkalinity and gel composition have a major influence on the crystallization process. Here the nucleation is pronounced influenced whereas the crystal growth is only marginally influenced.The physico-chemical characterization proves the formation of ,.reactive" and catalytic active gallosilicate species already in the gel, which are assumed to take part directly in the crystal growth process.

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