Transformation of methylcyclohexane on an FCC catalyst

Abstract

The transformation of methylcyclohexane at 723 K over on a USHY sample and on an FCC catalyst composed of 30% USHY and 70% matrix containing 25% Al2O3 was studied. With both samples, C2-C7 alkenes and alkanes, cyclopentane and methylcyclopentane (cracking products), dimethylcyclopentanes and ethylcyclopentane (isomers) and aromatics appeared as primary products. The activity and selectivity of fresh samples as well as the influence of coke deposits on porosity and selectivity are discussed

FTIR study of the relation, between extra-framework aluminum species and the adsorbed molecular water, and its effect on the acidity in ZSM-5 steamed zeolite

“…FTIR spectroscopic study of pyridine adsorption at T s = 200 °C (where T s is the temperature from which there is no overlap between the signals of the physisorbed and chemisorbed pyridine 22,[48][49][50] ) shows changes in the intensity of the bands between 1400 and 1570 cm -1 with the increase of the temperature of the hydrothermal treatment ( Figure 8). …”

Influência De Catalisadores Zeolíticos Nos Produtos De Craqueamento Do Óleo De Soja

“…A literatura aponta uma série de trabalhos utilizando materiais zeolíticos no craqueamento de óleos vegetais (Rahimi e Karimzadeh, 2011;Borges et al, 2011;Rabeharitsara et al, 2003;Scofield et al, 1998), porém, tais trabalhos baseiam-se no que atualmente é considerado um dos maiores desafios da ciência: o projeto e controle de sistemas químicos sobre múltiplas escalas. Nesse contexto, a catálise heterogênea tem se beneficiado de propriedades particulares desses materiais (Ocampo et al, 2010) e diferentes zeólitas com propriedades sensíveis ao seu tamanho são apontadas para governar a seletividade em diversas reações catalíticas (Yang et al, 2009) e, consequentemente, diversos materiais zeolíticos foram apontados como promissores catalisadores no craqueamento catalítico de óleos vegetais (Li et al, 2014), tais como ZSM-5/MCM-41 (Corma et al, 2013;Nam et al, 2011), HZSM-5 suportada em Ni e Mo (Cheng et al, 2014).…”