Study on the formation process of MoO 3 /Fe 2 (MoO 4 ) 3 by mechanochemical synthesis and their catalytic performance in
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RESEARCH PAPER
Study on the formation process of MoO3/Fe2(MoO4)3 by mechanochemical synthesis and their catalytic performance in methanol to formaldehyde Xue Liu1 · Ling‑tao Kong1 · Chao‑fan Liu1 · Sheng‑tao Xu1 · Dan‑dan Zhang1 · Feng‑yun Ma1 · Zheng‑ping Lu2 · Ji‑guang Sun2 · Jun Chen2 Received: 7 August 2019 / Accepted: 21 February 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Mechanochemical method has applied to the green preparation of iron-molybdenum catalyst efficiently, and their catalytic performance was evaluated by the oxidation of methanol to formaldehyde. In order to investigate the formation process of iron-molybdenum catalyst based on mechanochemical method, various characterization techniques have been employed. Results indicate that iron-molybdenum catalyst could not be generated during ball milling process without calcining, and calcination is crucial step to regulate the ratio of MoO3 and Fe2(MoO4)3. For the formation of MoO3 and Fe2(MoO4)3 phase, 180 °C could be the key turning temperature point. F e2(MoO4)3 and M oO3 phases are concurrently emerged when Mo/Fe atomic ratio exceeds 1.5. The aggregation of F e2(MoO4)3 is severe with the increasing calcination temperature. F e2(MoO4)3 is stable below 600 °C, while MoO3 phase could be subliming with the increasing temperature. The catalytic performance of iron-molybdenum catalyst has closely correlation with the phase compositions, which can be controlled by synthesis temperature and Mo/Fe molar ratio. The iron-molybdenum catalyst with Mo/Fe atomic ratio of 2.6 calcined at 500 °C for 4 h showed the best methanol conversion (100%) and formaldehyde yield (92.27%). Keywords Iron molybdate catalyst · Mechanochemical synthesis · Calcination temperature · Mo/Fe ratio · Methanol to formaldehyde
Introduction As a fascinating group of inorganic functional materials, metal molybdates (MMoO 4) are widely applicable for catalytic materials [1, 2], photocatalysis [3, 4], electrocatalysis [5, 6], luminescence materials [7], lithium-ion Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10973-020-09483-4) contains supplementary material, which is available to authorized users. * Ling‑tao Kong [email protected] 1
Key Laboratory of Coal Clean Conversion and Chemical Engineering Process Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, 666 Shengli Road, Ürümqi 830046, People’s Republic of China
Xinjiang Markor Chemical Industrial Co., Ltd, No. 1, Nanyuan Road, Korla Economic and Technical Development Zone, Korla 841000, People’s Republic of China
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batteries [8, 9] and so forth, which have attracted special attention recently. Iron-molybdenum catalyst is one of the most important metal molybdates, as the well-established industrial catalyst for the formaldehyde production based on methanol oxidation [10–16]. Generally, the industrial iron molybdate catalyst includes Fe2(MoO4)3 and M oO3. Mo excess is required to comp
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