Question $3(25$ marks$)$

$($a$)$ What is the difference between pre$-$and post$-$combustion capture technologies? Which

of these routes would be most suited to the generation of high purity hydrogen from

fossil fuels?

$(5$ marks$)$

$($b$)$ With the aid of simple flow diagram of the process, describe how direct air capture

$($DAC$)$ works.

$(4$ marks$)$

$($c$)$ The production of ammonia and methanol involves the steam reforming of methane to

produce syngas. Describe the process chemistry and operating conditions of this process

in the production of methanol and ammonia.

$(8$ marks$)$

$($d$)$ Briefly describe the process of gasification and the advantage of having gasification in

energy conversion. Name two practical applications where gasification is a part of the

energy conversion process.

$($e$)$ Describe two ways in which fuel cells differ from batteries.

$(2$ marks$)$