Synthesis and physicochemical study of ZSM-5 high-silica zeolite from natural raw materials

Aliev, A. M.; Mamedova, U. A.; Samedov, Kh. R.; Сарыджанов, А А; Agaeva, R. Yu.

doi:10.1134/s0036024411020026

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“…The molecule n -butylamine was reported (Sang et al 2004 , Zhao 2005 , Martins et al 2006 , Feng et al 2009 ) as an alternative templating agent to replace TPA-Br and TPA-OH and is about 100 times less expensive on a molar basis. In the past two decades, efforts have also been undertaken to identify inexpensive Si and Al sources to synthesize ZSM-5(Chareonpanich et al 2004 , Sanhueza et al 2004 , Mignoni et al 2007 , Aliev et al 2011 ) and it has been shown that kaolin clay and diatomaceous earth are two suitable and inexpensive sources of silica and alumina.…”

Section: Introductionmentioning

confidence: 99%

“…In most of these syntheses, the raw diatomaceous earth was acid treated to remove iron and other impurities. The conversion of diatomaceous earth to ZSM-5 was also studied in combination with other raw materials such as paper sludge ash (Wajima et al 2008 ) or volcanic ash (Aliev et al 2011 ). However, there are a few studies on the synthesis of ZSM-5 by using only diatomaceous earth as silica source.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between leached metakaolin and leached diatomaceous earth as raw materials for the synthesis of ZSM-5

et al. 2014

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Inexpensive raw materials have been used to prepare ZSM-5 zeolites with SiO2/Al2O3 molar ratios in the range 20 – 40. Kaolin or Bolivian diatomaceous earth was used as aluminosilicate raw materials and sodium hydroxide and n-butylamine were used as mineralizing agents and template. Dealumination of the raw materials by acid leaching made it possible to reach appropriate SiO2/Al2O3 ratios and to reduce the amount of iron and other impurities. After mixing the components and aging, hydrothermal treatment was carried out and the products were recovered The results clearly show for the first time that well-crystallized ZSM-5 can be directly prepared from leached metakaolin or leached diatomaceous earth using sodium hydroxide and n-butylamine as mineralizing agents and template under appropriate synthesis conditions. A longer induction time prior to crystallization was observed for reaction mixtures prepared from leached diatomaceous earth, probably due to slower digestion of the fossilized diatom skeletons as compared with that for microporous leached metakaolin. The use of leached diatomaceous earth allowed higher yield of ZSM-5 crystals within comparable synthesis times. However, low amounts of Mordenite formed, which was related to the high calcium content of diatomaceous earth. Another considerable advantage of diatomaceous earth over kaolin is that diatomaceous earth does not require heat treatment at high temperature for metakaolinization.

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