n sulfur + H2 <=> (n-1) sulfur + hydrogen sulfide + H(+)
n sulfur + h2 <=> (n-1) sulfur + hydrogen sulfide + h(+)
n sulfur + H2 <=> (n-1) sulfur + hydrogen sulfide + H(+)
n sulfur + h2 <=> (n-1) sulfur + hydrogen sulfide + h(+)