Effect of Si/Al ratio on mesopore formation for zeolite beta via NaOH treatment and the catalytic performance in α-pinene isomerization and benzoylation of naphthalene

A comparative study on the catalytic performance of different types of zeolites for biodiesel production

“…In general, the acid property was determined by the Si/Al ratios of the zeolites [35], and the results agreed well with the IEC test. The acid sites were mainly introduced by the Al in the framework and extra-framework from the zeolite.…”

Propene oligomerization to high-quality liquid fuels over Ni/HZSM-5

“…5 and the quantitative result is listed out in Table 2. For HZSM-5, the two distinct desorption peaks of NH 3 appeared at about 190 and 390°C, indicating that HZSM-5 presents weak and medium strong acidic sites simultaneously [25][26][27][28]. With the Ni loadings of 0.76-5.05 wt.% were implemented, the peak position and area of weak acidic sites kept almost unchanged, while the peak of medium strong area gradually decreased, indicating the continuous reduction of medium strong acid sites on the Ni/HZSM-5 surfaces.…”

Influence of crystal size of HZSM-5 on hydrodeoxygenation of eugenol in aqueous phase

“…As shown in Fig. S3, there are two ammonia desorption peaks for all catalysts, which correspond to two different types of acid site [21,22]. After the deconvolution and ammonia quantification [23], each profile can be deconvoluted by the Gauss curve fitting method into two separated peaks, where the amounts of weak and strong acid sites can be calculated and summarized in Fig.…”