Interaction of hydrogen sulfide with molybdophosphoric heteropolyacid

Liquefaction of Wyodak Coal with Phosphomolybdic Acid

“…Prolonged heating in H 2 at 300 °C does not destroy the Keggin anion but results in broadening of the Mo-O bonds in the IR. 23 Yong et al observed that part of the Mo 6+ is reduced to Mo 5+ atoms in this temperature range with electron transfer and formation of H + . 22 The essential features of the Keggin structure remain.…”

“…Tsigdinos observed in N 2 that only MoO 3 was formed, whereas Yong et al observed in H 2 that both MoO 2 and free metal are formed. Prolonged heating in H 2 at 300 °C does not destroy the Keggin anion but results in broadening of the Mo−O bonds in the IR . Yong et al observed that part of the Mo 6+ is reduced to Mo 5+ atoms in this temperature range with electron transfer and formation of H + .…”

“…If temperature is further increased, the H + ions combine with structural oxygen forming water leading to destruction of the Keggin ion. Shokhireva et al reported that treating PMA with H 2 S at temperatures up to 300 °C causes structural changes but does not destroy the Keggin anion . However, at 400 °C, the anion is ultimately destroyed producing MoS 2 and MoO x .…”

“…Shokhireva et al reported that treating PMA with H 2 S at temperatures up to 300 °C causes structural changes but does not destroy the Keggin anion. 23 However, at 400 °C, the anion is ultimately destroyed producing MoS 2 and MoO x .…”