(a)

(b)

(c)

Figure 2: Schematic of (a) membrane reactor V1: membrane, 2; Teflon stir bar, 3; stainless stirrer, 4; membrane reactor, 5; magnetic stirrer, 6; mechanical stirrer, 7; sampling point, 8; cooling circulator bath [12]. (b) Membrane reactor H1. (c) Membrane reactor H2.